INTEGRATED CIRCUIT HAVING RE-CONFIGURABLE BALUN CIRCUIT AND METHOD THEREFOR
First Claim
1. A circuit comprising:
- a balun transformer having first and second windings, the first winding having first and second terminals and the second winding having first and second terminals;
a first variable capacitor having a first plate electrode coupled to the first terminal of the first winding, and a second plate electrode coupled to the second terminal of first winding, the first variable capacitor being tunable between first and second capacitance values, the first capacitance value for allowing the circuit to operate in a first frequency band and the second capacitance value for allowing the circuit to operate in a second frequency band, wherein the first frequency band is different from the second frequency band; and
a second variable capacitor having a first plate electrode coupled to the first terminal of the second winding, and a second plate electrode coupled to the second terminal of the second winding, the second variable capacitor being tunable between third and fourth capacitance values, the third capacitance value for allowing the circuit to operate in the first frequency band and a fourth capacitance value for allowing the circuit to operate in the second frequency band.
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Accused Products
Abstract
A balun circuit comprises a balun transformer having first and second windings, and first and second variable capacitors. The first variable capacitor has a first plate electrode coupled to the first terminal of the first winding, and a second plate electrode coupled to the second terminal of the first winding. The second variable capacitor has a first plate electrode coupled to the first terminal of the second winding, and a second plate electrode coupled to the second terminal of the second winding. The first variable capacitor is tunable between first and second capacitance values. The second variable capacitor is tunable between third and fourth capacitance values. Tuning the variable capacitors allows the balun circuit to be re-configurable to operate in both the first frequency band and the second frequency band.
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Citations
20 Claims
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1. A circuit comprising:
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a balun transformer having first and second windings, the first winding having first and second terminals and the second winding having first and second terminals; a first variable capacitor having a first plate electrode coupled to the first terminal of the first winding, and a second plate electrode coupled to the second terminal of first winding, the first variable capacitor being tunable between first and second capacitance values, the first capacitance value for allowing the circuit to operate in a first frequency band and the second capacitance value for allowing the circuit to operate in a second frequency band, wherein the first frequency band is different from the second frequency band; and a second variable capacitor having a first plate electrode coupled to the first terminal of the second winding, and a second plate electrode coupled to the second terminal of the second winding, the second variable capacitor being tunable between third and fourth capacitance values, the third capacitance value for allowing the circuit to operate in the first frequency band and a fourth capacitance value for allowing the circuit to operate in the second frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated circuit comprising:
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an integrated passive device (IPD) balun transformer having first and second windings, the first winding having first and second terminals and the second winding having first and second terminals; a first capacitor coupled between the first and second terminals of the first winding; a first variable capacitor coupled in parallel with the first capacitor, the first variable capacitor being tunable between first and second capacitance values; a second capacitor coupled between the first and second terminals of the second winding; and a second variable capacitor coupled in parallel with the second capacitor, the second variable capacitor being tunable between third and fourth capacitance values. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for operating a multi-band balun circuit, the method comprising:
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providing a balun transformer having first and second windings; coupling a first variable capacitor between first and second terminals of the first winding; coupling a second variable capacitor between first and second terminals of the second winding; providing a mode signal to cause the multi-band balun circuit to operate in a first frequency band; tuning both the first variable capacitor to provide a first capacitance value and tuning the second variable capacitor to provide a second capacitance value in response to the mode signal; providing the mode signal to cause the multi-band balun circuit to operate in a second frequency band different from the first frequency band; and tuning the first variable capacitor to provide a third capacitance value different from the first capacitance value and tuning the second variable capacitor to provide a fourth capacitance valve different from the second capacitance value. - View Dependent Claims (17, 18, 19, 20)
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Specification